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devel / comp.unix.shell / Problem with type system in ksh - Memory fault(coredump)

SubjectAuthor
* Problem with type system in ksh - Memory fault(coredump)Janis Papanagnou
`* Re: Problem with type system in ksh - Memory fault(coredump)Martijn Dekker
 `* Re: Problem with type system in ksh - Memory fault(coredump)Janis Papanagnou
  `- Re: Problem with type system in ksh - Memory fault(coredump)Martijn Dekker

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Problem with type system in ksh - Memory fault(coredump)

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From: janis_pa...@hotmail.com (Janis Papanagnou)
Newsgroups: comp.unix.shell
Subject: Problem with type system in ksh - Memory fault(coredump)
Date: Wed, 21 Sep 2022 12:14:29 +0200
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 by: Janis Papanagnou - Wed, 21 Sep 2022 10:14 UTC

In my daily work I'm rarely using types (typeset -T) with ksh.
Currently I'm playing around with it and stumbled across an error.

I get the error in version sh (AT&T Research) 93u+ 2012-08-01
and as well in 93u+m (alpha) that I have installed here.

(Note: The reproducible problem arises in a larger, more complex
program; I was unable to reduce the program and still get that
error, specifically the excerpt below does not trigger it, but I
use it to explain the changes [in the larger program] that made
the coredump problem go away.)

#!/usr/bin/ksh

typeset -T Coord_t=( typeset -i x=0 ; typeset -i y=0)
enum State_t=( Active Pending Finished )
enum Dir_t=( N S W E )

typeset -T Job_t=(
State_t state
Coord_t pos
Dir_t from
)

The problem seems to only appear if one of the enum-types (Dir_t
or State_t) is the first entity in the Job_t structure. Having
the Coord_t entity first will not trigger that "Memory fault" and
everything works smoothly.

Has anyone observed that behavior/bug as well and can share any
experiences or insights? (I'm reluctant to continue using types
since it might be an unreliable feature.)

Janis

Re: Problem with type system in ksh - Memory fault(coredump)

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From: mart...@inlv.demon.nl (Martijn Dekker)
Newsgroups: comp.unix.shell
Subject: Re: Problem with type system in ksh - Memory fault(coredump)
Date: Thu, 22 Sep 2022 18:42:42 +0200
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 by: Martijn Dekker - Thu, 22 Sep 2022 16:42 UTC

Op 21-09-22 om 12:14 schreef Janis Papanagnou:
> (Note: The reproducible problem arises in a larger, more complex
> program; I was unable to reduce the program and still get that
> error, specifically the excerpt below does not trigger it,

In order to trace the problem I will need a reproducer that actually
triggers the crash. Please email me or file a bug at github.

--
|| modernish -- harness the shell
|| https://github.com/modernish/modernish
||
|| KornShell lives!
|| https://github.com/ksh93/ksh

Re: Problem with type system in ksh - Memory fault(coredump)

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From: janis_pa...@hotmail.com (Janis Papanagnou)
Newsgroups: comp.unix.shell
Subject: Re: Problem with type system in ksh - Memory fault(coredump)
Date: Thu, 22 Sep 2022 21:17:20 +0200
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 by: Janis Papanagnou - Thu, 22 Sep 2022 19:17 UTC

On 22.09.22 18:42, Martijn Dekker wrote:
> Op 21-09-22 om 12:14 schreef Janis Papanagnou:
>> (Note: The reproducible problem arises in a larger, more complex
>> program; I was unable to reduce the program and still get that
>> error, specifically the excerpt below does not trigger it,
>
> In order to trace the problem I will need a reproducer that actually
> triggers the crash. Please email me or file a bug at github.

Thank you for asking! - I've just sent you a shell script by email.

Janis

Re: Problem with type system in ksh - Memory fault(coredump)

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From: mart...@inlv.demon.nl (Martijn Dekker)
Newsgroups: comp.unix.shell
Subject: Re: Problem with type system in ksh - Memory fault(coredump)
Date: Fri, 23 Sep 2022 23:52:31 +0200
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 by: Martijn Dekker - Fri, 23 Sep 2022 21:52 UTC

Op 22-09-22 om 21:17 schreef Janis Papanagnou:
> On 22.09.22 18:42, Martijn Dekker wrote:
>> In order to trace the problem I will need a reproducer that actually
>> triggers the crash. Please email me or file a bug at github.
>
> Thank you for asking! - I've just sent you a shell script by email.

The search for a fix is on at: https://github.com/ksh93/ksh/issues/537

--
|| modernish -- harness the shell
|| https://github.com/modernish/modernish
||
|| KornShell lives!
|| https://github.com/ksh93/ksh

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